专题图服务类构造函数。
例如：
//设置专题图子项的stytle
ServerStytle* stytle1 =[[ServerStytle alloc]initLineStytleWithFillForeColor:[UIColor colorWithRed:242/255.0 green:48/255.0 blue:48/255.0 alpha:1] lineColor:[UIColor colorWithRed:242/255.0 green:48/255.0 blue:48/255.0 alpha:1] lineWidth:1];
//设置专题图子项的stytle
ServerStytle* stytle2 =[[ServerStytle alloc]initLineStytleWithFillForeColor:[UIColor colorWithRed:255/255.0 green:159/255.0 blue:25/255.0 alpha:1] lineColor:[UIColor colorWithRed:255/255.0 green:159/255.0 blue:25/255.0 alpha:1] lineWidth:1];
ServerStytle* stytle3 =[[ServerStytle alloc]initLineStytleWithFillForeColor:[UIColor colorWithRed:91/255.0 green:195/255.0 blue:69/255.0 alpha:1] lineColor:[UIColor colorWithRed:91/255.0 green:195/255.0 blue:69/255.0 alpha:1] lineWidth:1];
//设置专题图默认stytle
ServerStytle* defaultStytle =[[ServerStytle alloc]initLineStytleWithFillForeColor:[UIColor colorWithRed:0/255.0 green:0/255.0 blue:0/255.0 alpha:1] lineColor:[UIColor colorWithRed:0/255.0 green:0/255.0 blue:0/255.0 alpha:1] lineWidth:1];
//设置专题图子项
ThemeUniqueItem *item1=[[ThemeUniqueItem alloc]initWithUnique:@"拥挤" serverStyle:stytle1];
ThemeUniqueItem *item2=[[ThemeUniqueItem alloc]initWithUnique:@"缓行" serverStyle:stytle2];
ThemeUniqueItem *item3=[[ThemeUniqueItem alloc]initWithUnique:@"畅通" serverStyle:stytle3];
NSMutableArray *items=[[NSMutableArray alloc]initWithObjects:item1,item2,item3,nil];
//设置单值专题图
ThemeUnique *themeUinque=[[ThemeUnique alloc]initWithUniqueExpression:@"TrafficStatus"items:items defaultStyle:defaultStytle];
//设置专题图参数
ThemeParameters *param=[[ThemeParameters alloc]initWithDatasetNames:datasetName dataSourceName:@"Changchun" themeUnique:themeUinque];
//初始化专题图服务
ThemeService *service=[[ThemeService alloc]initWithURL:tileThing];
//监听专题图回调函数
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(processCompletedTheme:) name:@"themeCompleted" object:nil];
//将客户端的专题图参数传递到服务端。
[service processAsync:param];
Parameters